[raudio]: Replace DrWAV with miniaudio WAV encoder

Miniaudio includes DrWAV, and their encoder is just a wrapper. Now we
don't have 2 copies of it.

examples/audio/audio_wave_export.c

@@ -0,0 +1,31 @@
+/*******************************************************************************************
+*
+*   raylib [audio] example - sound loading
+*
+*   Example complexity rating: [★☆☆☆] 1/4
+*
+*   Example originally created with raylib 5.5
+*   Example contributed by Torphedo (@torphedo)
+*
+*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
+*   BSD-like license that allows static linking with closed source software
+*
+*   Copyright (c) 2026 Torphedo (@torphedo)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main(void)
+{
+    Wave wave = LoadWave("resources/country.mp3");
+    if (wave.data) {
+        ExportWave(wave, "country.wav");
+        UnloadWave(wave);
+    }
+
+    return 0;
+}